Frank Proczek, 58, died of heart disease, with chronic alcoholism and heat stress as contributing factors.

All four died on Thursday.

On Thursday, autopsies confirmed the first two heat-related deaths of the season in Cook County, 53-year-old Eugene Burns of Maywood and 48-year-old Jon McCullough, of the North Side Ravenswood neighborhood.

Thursday and Friday’s high temperature set a new record of 103 degrees, while Wednesday’s high was 102 degrees.